iOS开发--利用keychain保存用户数据

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#import <Foundation/Foundation.h>#import <Security/Security.h>@interface HsKeychain : NSObject+ (void)save:(NSString *)service data:(id)data;+ (id)load:(NSString *)service;+ (void)deleteData:(NSString *)service;@end

#import "HsKeychain.h"@implementation HsKeychain+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {    return [NSMutableDictionary dictionaryWithObjectsAndKeys:            (__bridge id)kSecClassGenericPassword,(__bridge id)kSecClass,            service, (__bridge id)kSecAttrService,            service, (__bridge id)kSecAttrAccount,            (__bridge id)kSecAttrAccessibleAfterFirstUnlock,(__bridge id)kSecAttrAccessible,            nil];}+ (void)save:(NSString *)service data:(id)data {    //Get search dictionary    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];    //Delete old item before add new item    SecItemDelete((__bridge CFDictionaryRef)keychainQuery);    //Add new object to search dictionary(Attention:the data format)    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge id)kSecValueData];    //Add item to keychain with the search dictionary    SecItemAdd((__bridge CFDictionaryRef)keychainQuery, NULL);}+ (id)load:(NSString *)service {    id ret = nil;    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];        [keychainQuery setObject:(id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData];    [keychainQuery setObject:(__bridge id)kSecMatchLimitOne forKey:(__bridge id)kSecMatchLimit];    CFDataRef keyData = NULL;    if (SecItemCopyMatching((__bridge CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {        @try {            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];        } @catch (NSException *e) {            NSLog(@"Unarchive of %@ failed: %@", service, e);        } @finally {            }    }    if (keyData)        CFRelease(keyData);    return ret;}+ (void)deleteData:(NSString *)service {    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];    SecItemDelete((__bridge CFDictionaryRef)keychainQuery);}@end

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